Just to expand a bit on my original answer... I view online communities like this one very much like a chorus. There are the singers (both soloists & chorus); there is the orchestra; there is the conductor; there is the score; there is the crew working behind the scenes; & there is the audience. Each and every single part is valuable, necessary, & creates the experience itself.
We have both short & longtime members who rarely or never post, along with thousands reading, each and every single day. Audience. We have soloists, writing articles. We of the chorus, posting threads or responding to threads (some people rarely if ever post, but respond often; other people respond often but rarely if ever start threads). Et cetera. In a big way. There are roles suitable to each, and roles can be shifted around a great deal, by personal preference.
Knowing myself, I will never -ever- be part of the daily welcoming group. That's not something i can do even when not symptomatic, much less when I'm doing badly. I fit elsewhere, in the community.
That said, (I looked it up) I've posted over 400 times in the introduction forum (that's less than 10% of what I "do" here, aka it's a very small part of my role in the community). Some of those have taken a great deal of time and energy -often the shortest ones, when a bare nod is the absolute most I'm capable of the moment. Do I post to every introduction? Hell no. Do some people? Very nearly, yes. Others, meanwhile, only post to intros where the trauma is similar. Or if it's a supporter/sufferer/undiagnosed/etc. Or, or, or. Just like some people only post in certain forums, or only write in chat, or, or, or.
Different roles. We each choose our own. Each is valuable.